I've always had a problem with peristaltic pumps. Given it's all electrolyte, would other tech like MH be possible?
I have experience with peristaltic pumps. What issues do you mean?
Plastic tubing wears out because its continuously deformed. Also the backflow
Hmm.. I use cheapass silicone tubing, 5mm ID 7mm OD and wear hasn't been an issue. Perhaps you compress the tube too much. The tube should be held shut so that no liquid flows backwards but also not compressed so much that it wears the tubing out. Your pump should have a variable tensioner on it.
Perhaps also you don't have enough rollers. At least one roller needs to be in full contact with the tubing (compressing) so that there is no backflow.
Not sure what applications you have for your stack, but runtime of tubes is significant when considering operational lifetime in design.
Hmm. I have a 12 channel peristaltic pump at the moment that is meant for watering plants. Meaning they have a lot of downtime so the tubes are compressed for quite some time at the same spot.
Ignore the yellow rollers in the image below, that was experimental. The final version has 3 all metal rollers so the tube is always compressed at one point. Over the tubes are U shaped bracket is mounted for compression.
It's an entirely custom design from scratch and haven't uploaded the model to a 3D printing website yet but plan on doing so.
Not sure what MH is but in bigger systems magnetically coupled centrifugal pumps are used afaik.
Interesting project! I will have to give it a look.
sourcing the materials can be a bit of a challenge
Any more details here? I'm guessing the necessary material for electrolytic and what not? Do you know about the boring adjacent stuff like measuring (eg how accurate do the measurements need to be, how precise, etc), disposal, etc?
You need Polypropylen filament for printing, graphite felt as electrode, grafoil gasket material as bipolar plate, brass plate as current collector (cut by cnc), silicone gasket material and a measurment device like a potentiostat.
If you're really interested, living somewhere in the EU, I could send you some stuff. I also have the chemicals in big quantities.
Why brass and why a thick plate of it? I've designed and built RFBs; we played with aluminum 'sticker' sheets on some rigid backing and it worked fine.
I'm not the designer of this. I've also wondered. Maybe it's just a practical choice to have something tough to attach your wires to.
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